Miami Marlins vs. New York Mets

Platform comparison

Active sub-markets

Market context

The Miami Marlins travel to New York on 31 May for a 1:40 PM ET matchup against the Mets at Citi Field. Polymarket currently prices a Marlins victory at 42 per cent, implying roughly even odds with a slight lean toward the home side. This contract settles on the official MLB result, with conditional tokens on Polygon backing both outcomes in USDC. Postponements keep the market open until completion; cancellations or ties resolve 50-50.

Historical context matters here: the Mets have won roughly 53 per cent of home games against Miami over the past five seasons, though this varies significantly by year and roster composition. The 2024 season saw the Mets struggle early before mid-season adjustments, whilst the Marlins have remained competitive in the NL East despite lower payroll constraints. Single-game variance in baseball is substantial—starting pitcher matchups, bullpen availability, and weather conditions at Citi Field typically account for larger probability swings than season-long trends.

Traders should monitor starting pitcher assignments and any late roster moves announced before first pitch. Recent injury reports from both clubs, particularly among position players or relief arms, can shift the implied probability meaningfully. Weather forecasts for New York on 31 May—wind direction and temperature affect ball carry at Citi Field—warrant checking closer to game time. The Mets' recent form heading into late May and any trades or call-ups in the preceding week will also influence how the market reprices relative to the current 42 per cent floor.

Methodology

This page reviews Miami Marlins vs. New York Mets across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket UK?

Zero. Polymarket UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.